有ECC 的SPI NAND 注意事项：(没有ECC功能的芯片，ECC选项是禁用的)
1. T56默认全部都使能ECC的， 如果要关闭可以自已在选项中关闭。使能读取是最好的选择，可靠性高，
能保证每次读取的数据都一样，不会有翻转发生。
2. 使能ECC读取 + 使能ECC 写入，（数据可靠，可靠性同母片）
3. 使能ECC读取 + 禁止ECC写入 （数据可能出现翻转，比母片数据的可靠性差）
4. 禁止ECC读取 + 使能ECC写入 （绝对禁用，如果芯片质量差，设备100%不能用）
5. 禁止ECC读取 + 禁止ECC写入， 翻转的概率是，第3项方法的2倍，错误的可能性更大，比母片数据的可靠性更差
6. 如果设备没有使用内部ECC ，则读和写必须禁用内部ECC，进行操作。
Notes for SPI NAND with ECC: (for chips without ECC function, ECC option is disabled)
1. All T56 can be ECC enabled by default. If you want to close it, you can disable it in the option. Enable read is the best choice with high reliability, It can ensure that the data read each time is the same, and there will be no flipping.
2. Enable ECC read + enable ECC write, (the data is reliable as the master chip)
3. Enable ECC read + disable ECC write (data may be flipped, which is less reliable than the master chip data)
4. Disable ECC read + enable ECC write (absolutely disabled, if the chip quality is poor, the device is 100% unusable)
5. Disable ECC reading + Disable ECC writing. The probability of overturning is twice that of the third method. The possibility of error is greater, and the reliability of data on the master chip is worse
6. If the device does not use internal ECC, read and write must disable internal ECC for operation. This should be rare |
